THe Van Aken box has produced good results on lb7 zf trucks as well as the ppe hot et programer. EFI is the best way to go IMO For any of the trucks! IF you get efi, i have some good tunes but kicking the power up on the stock flywheel will kill it in 1 drive if driven to hard with lots of power!
Some guys have dynoed 500 on just a ppe or a va with a lb7, but only some not many. On the same dyno i made 414hp with a ppe hot et and 459 with efi. Actuall hp #'s depend on the truck and dyno. Those #'s both being made on the same dyno shows the difference! But the efi can make much smoother and more driveable!
Im still using v1, i like things the way they are the v2 has the capabiliteis to tune the 06+ trucks and gives you a handhelds tuner that you load your tunes into from your computer and then you can carry it around with you instead of your laptop and it will work just like a regular handheld tuner!
EFI Live is computer based tuning software, it is available from quite a few different diesel shops. I'm not sure how many of our supporting vendors here carry it, but I do know for sure that Discount Power Parts is one of them.